SXJMMAKY. 31 
surfaces and hairs. After this is accomplished the bee usually leaves 
the cell without paying further attention to the two pellets of pollen 
although some collecting bees will stick the head into the cell, possi- 
bly to assure themselves that the pollen is properly deposited. It has 
been stated by some (Cheshire, for example) that the spur upon the 
middle leg is used to help pry the pollen mass from the corbicula. 
This structure is in close proximity with the mass while the middle 
leg is pushing downward upon it, but its small size renders difficult 
an exact estimate of its value in this connection. It is certainly true 
that the entire planta of the middle leg is thrust beneath the upper 
end of the pollen mass, but the spur may be used as an entering 
wedge. 
Pollen masses which have been dropped by the collecting bee may 
remain for some time within the cell without further treatment, but 
usually another worker attends to the packing of the pollen shortly 
after it has been deposited. To accomplish this the worker enters the 
cell head first, seizes the pollen pellets with its mandib]es, breaks 
them up somewhat or flattens them out, probably mingles additional 
fluid with the pollen, and tamps down the mass securely in the bot- 
tom of the cell. As is shown by the analyses of corbicular pollen and 
of stored pollen, certain substances are added to the pollen after the 
collecting bee leaves it in the cell. Sugar is certainly added, and it is 
generally supposed that secretions from some of the salivary glands 
are mixed with the pollen after deposition. It appears probable that 
the stored pollen or " beebread " is changed somewhat in chemical 
composition through the action of the fluids which have been added 
to it, either during the process of collection, at the time of packing, 
or later. 
SUMMARY. 
Pollen may be collected by the worker bee upon its mouthparts, 
upon the brushes of its legs, and upon the hairy surface of its body. 
When the bee collects from small flowers, or when the supply is not 
abundant, the mouthparts are chiefly instrumental in obtaining the 
pollen. 
The specialized leg brushes of the worker are used to assemble the 
pollen, collecting it from the body parts to which it first adheres and 
transporting it to the pollen baskets or corbiculse of the hind legs. In 
this manipulation the forelegs gather pollen from the mouthparts and 
head; the middle legs, from the forelegs and from the thorax; the 
hind legs, from the middle legs and from the abdomen. 
The pollen baskets are not loaded by the crossing over of one hind 
leg upon the other or to any great extent by the crossing of the middle 
legs over the corbiculse. The middle legs deposit their loads upon the 
